J1305_200711 - Two-Block Warning and Limit Systems in Lifting Crane Service

Details Document Number: J1305_200711 Revision Number: Title Two-Block Warning and Limit Systems in Lifting Crane Service Scope The purpose of this SAE Recommended Practice is to establish the minimum performance requirements of devices which signal and/or automatically prevent two-blocking. This SAE Recommended practice applies to cranes in lifting crane service which are equipped with two-block warning and/or limit systems.

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